Gear.



H. L. HUDSON.

GEAR.

APPLICATION FILED Nov. 30. I9I4.

Patented Dec. 14, 1915.

2 SHEETS-SHEETI mali',

H. L. HUDSON.

GEAR.

APPucATloN man Nov. 3o. 1914.

Patented Dec. 14, 1915.

2 SHEETS-SHEET 2. j..

C \B A PLNGRPH CO WASHINGTON D C HARRISON L. HUDSON, OF CHICAGO,ILLINOIS.

GEAR.

Specification of Letters Patent.

Patented Dec. i4, i915.

Application led November 30, 1914. Serial No. 874,923.

To all whom 1f-may concern Be it known that I, HARRISON L. HUDSON,citizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented a certain new and usefulImprovement in Gears, of which the following is a full, clear, concise,and exact description, reference being had to the accompanying drawings,forming a part of this specification.

My invention relates to power transmission gears of that class in whichthe toothed portions are separated from but are movable with respect tothe body portions and the invention is of particular service where soundinsulating cushioning `material Vis interposed between the toothed andbody members of the gears to reduce or eliminate the noise due to gearoperation. A gear of this general class is disclosed by my United StatesPatent 1,043, 012, dated October 29, 1912, wherein I have shown aplurality of guiding structures each made up of elements included in theformation of a toothed ring and body portion oi a gear, whereby thesetwo gear parts are interlocked or interengaged in such a manner as toprevent undesirable circumferential movement between these two gearparts. rlhe toothed ring of the gear is iiexible so that it may beforced out of its true shape when encountering unusual load, and isresilient so that it may automatically resume its true shape when theundue load is removed, the guiding means determining the direction inwhich the toothed ring may flex when subiect to undue load and mayreturn when resuming normal shape.

My present invention has for one of its objects an improved form ofguiding structure whereby the parts may more readily be assembled anddisassembled and for another of its objects the provision of means forcompensating for the contraction of the fibrous, feltlike or othercontractible sound deadening material which intervenes between thetoothed and body members of the gear so that this sound deadeningmaterial may continue to perform its Jfunction.

l will explain my invention more fully by reference to theaccompanying;v drawings showing vthe preferred embodiment thereof In thedrawing Figure l is a face view,

Ypartially broken away, illustrating one form of the invention; Fig. 2is a sectional view on line 2 2 of Fig. l; Fig. 3 is a detail view of achanneled coupling lug entering inte the construction; Fig. 4 is a viewon line 4 4 of Fig. 2; Fig. 5 is a sectional elevation illustrating amodiication; Fig. 6 is a View on line 6 6 of Fig. 5; and Fig. 7 is asectional elevation illustrating still another modiication.

Like parts'are indicated by similar characters of reference throughoutthe different tigures.

The body portion l of the gear is illustrated as bein(r of skeletonconstruction and is surrounded by a. ring 2 which is provided with gearteeth 3 upon its outer periphery. The ring 2 is flexible so that it maybe forced ont ot its true circular shape and is resilient so that it mayautomatically resume its proper shape, A composite cushion is interposedbetween the body l and the ring 2. this composite cushion including asound deadening element 4 which is backed bv springs 41 (which may bevariously formed and arrangedl that are depressed bv the sound deadeningmaterial whereby the springs. due to their own rcsilience. will pressthe felt outwardly to maintain it in constant engagement with the innersurface of the ring 2. The SDVILJS iwill follow the sound deadeningmaterial 4 as this material contracts so that no space will intervenebetween the ring` 2 and the sound deadening material 4. The two elements4. 41 of the composite cushion thus cooperate to constitute a sounddeadeninf or insulating element and are together sulicientlv resilientto ll the changeable clearance between the gear elements l and 2. Thecushion will yield to permit the toothed ring to move with respect tothe axis of rotation of the body member l and transversely of suchaxis'. the clearance between the members 1 and 2 of the gear being pet'-erablV inst sufficient to permit the gear teeth oi' another xQe'ar thatmesh with the gear teeth 3 to have their outer edges reach the pitchcircle of the gear teeth 3, by which arrangement the gears will notbecome unmeshed although the toothed ring 2 is permitted to move awayfrom the gear with which it is in mesh, when the teeth 3 encounterunusual opposition. In order to Vprevent undesirable relativecircumferential movement of the members 1 and 2, 1 provide a .pluralityof insetting coupling lugs 5 that are secured between the insettingflanges 21 upon the ring 2 by means of riveting pins (i. These lugs arebottomed upon the inner cylindrical base of the ring 2 on which accountthe elements 4, 411 of the composite cushion are divided into sectionsor sets that intervene between adjacent lugs 5. rfliese lugs areprovided with insetting channels 7 located transversely of the plane ofthe gear. There are desir-ably three such lugs spaced equidistant aroundthe `gear. Each channel or recess 7 receives a radially disposed orlalined coupling block 8 that is in free sliding fit with the channelside walls which thus coperate with the engaging block 8 to preventundesirable circumferential movement relatively between the members 1and l of the gear. The three coupling blocks are rigidly secured, bymeans of riveting pins 9, between the spaced apart rings or wallportions 10 that constitute portions of the body member 1, the couplingblocks thus being in fixed relation to the center of the body Igearmember 1. Suflicient clearance normally intervenes between the outersurfaces of the coupling blocks S and the bottoms of the channels 7 topermit of the desired relative movement l between the ring and bodymembers of the gear.

the elements 4f, 41 is compressed consequent upon relative movementbetween the ring and bodv members of the gear, the coupling lugs 5 willmove radially of the gear, being guided in their radial movement by theradially disposed or alined guiding blocks 8. The clearance between thebottoms of the channels 7 and the outermost faces of the blocks 8permits the lugs 5 to slide toward the axis of rotation of the gear asthese lugs become interposed between the place of unusual pressure uponthe teeth 3 and the shaft 11 upon which the body portion of the gear iskeyed. The toothed ring being sufficiently flexible, the portion thereofthat is immediately subject to unusual pressure or load is moved towardthe body of the gear without accompanying undesirable circumferentialmotion owing to the guide structure which I have provided. lVhen theunusual load has been removed the ring will automatically resume itsproper shape due `to resiliency. Separation of the members 1 and 2 ofthe gear longitudinally of the axis is prevented because of theinterposition of the insetting lugs 5 between the ring portions 10 ofthe body member 2 that engage the end faces of the lugs (these faces areparallel with the faces of the gear and included in the plane ofrotation of thegear), the gear structure being further 'strengthened atthe localities of said lugs by the webs 12 that form, with the walls 10,radially disposed pockets in which the lugs 5 may reciprocate. Holes 13are passed through the ring 2V where the lugs 5 are located so that themembers of the gear may readily be separated, after the pins 6 and 9 Yare removed, by means of a punch that may prevent the coil springs frominjuring the sound deadening material.

lVhile I have herein shown and particularly described the preferred4embodiment of my invention I do not wish to be limited to the precisedetails of construction shown as changes may readily be made withoutdeparting from the spirit of my invention, but

Having thus described my invention I claim as new and desire to secureby Letters Patent the following 1. A gear including spaced apart toothedand body portions that are relatively movable transversely of the axisof rotation; and a guide structure having complemental portions that areprovided upon said gear portions for defining the relative movementbetween said gear portions transversely of the aXis of rotation andwhich guide structure portions are in the form of displaceableinterengaging coupling lugs and coupling blocks.

2. A gear including spaced apart toothed and body members: and a guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to define relative movementbetween said members transversely of the axis of rotation, the toothedmember of the gear being of ring like formation and suiciently flexibleto permit it to be moved with respect to the body member of the gear atthe part where unusual load is encountered and being sufficientlyresilient to permit it to resume its proper shape when the undue load isremoved, the aforesaid guide structure portions being in the form ofcoupling lugs and coupling blocks in sliding fit with said lugs, therebeing sufficient clearance to permit of the flexible movement of thering member of the gear.

3. A gear including spaced apart toothed and body members; anda guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to define relative movementbetween said members transversely of the axis of rotation, the toothedmember of the gear being of ring like formation and suflicientlyflexible to permit it to be moved with respect to the body member of thegear at the part where unusual load is encountered and beingsufficiently resilient to permit it to resume its proper shape when theundue load is removed, the aforesaid guide structure portions being inthe form of insetting coupling lugs having channels upon their innerends extending transversely of the plane of the gear and carried by thering member of the gear and coupling blocks carried by the body memberof the gear and in sliding fit with said lugs, sufficient clearanceintervening between the bottoms of the channels and the outermost facesof said blocks to permit of the flexible movement of the ring member ofthe gear and the accompanying movement of the coupling lugs carriedthereby, the body member of the gear having portions which engage endfaces of the coupling lugs to prevent longitudinal displacement of thegear members.

ll. A gear including spaced apart toothed and body members relativelymovable in the plane of the gear; and a composite cushion interposedbetween these gear members, a portion of this cushion being in the formof a body of sound deadening material engaging one of the members and a.spring element in engagement with this sound deadening material and theother gear member.

5, A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to deiine relative movementbetween said members transversely of the axis of rotation, the toothedmember of the gear being of ring like formation and suflicientlyflexible to permit it to be moved with respect to the body member of thegear at the part where unusual load is encountered and beingsufficiently resilient to permit it to resume its proper shape when theundue load is removed, the aforesaid guide structure portions being inthe form of insetting coupling lugs having channels upon their innerends extending transversely of the plane of the gear and carried by thering member of the gear and coupling blocks carried bythe body member ofthe gear and in sliding fit with said lugs,suffieient clearanceintervening between the bottoms of the channels and the outermost facesof said blocks to permit of the flexible movement of the ring member ofthe gear and the accompanying movement of the coupling lugs carriedthereby, the body member of the gear having spaced apart wall portionsl() into the spacing between which the insetting lugs project to preventlongitudinal displacement of the toothed and body members of the gear.

G. A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are pro- .vided upon saidmembers, and which guide structure serves to define relative movementbetween said members transversely of the axis of rotation, the toothedmember of the gear being of ring like formation and suflicientlyflexible to permit it to be moved with respect to the body member of thegear at the part where unusual load is encountered and beingsufficiently resilient to permit it to resume its proper shape when theundue load is removed, the aforesaid guide structure portions being inthe form of insetting coupling lugs having channels upon their innerends extending transversely of the plane of the gear and carried by thering member of the gear and coupling blocks ear ried by the body memberof the gear and in sliding lit with said lugs, suliicicnt clearanceintervening between the bottoms of the channels and the outermost facesof said blocks to permit of the flexible movement of the ring member ofthe gear and the accompanying movement of the coupling lugs carriedthereby, the body member of the gear having spaced apart wall portionsl0 into the spacing between which the insetting lugs project to preventlongitudinal displacement of the toothed and body members of the gear,there being' also webs 1Q which coperate with the wall portions l0 indefining pockets in which the lugs reciprocate and which pockets aresufficiently deep to permit the lugs, when removed, to be received fullytherein.

7. A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to define relative movementbetween said members transversely of the axis of rotation, the toothedmember of the gear being of ring like formation and suflicientlyflexible to permit it to be moved with respect to the body member of thegear at the part where unusual load is encountered and beingsufliciently resilient to permit it to resume its proper shape when theundue load is removed, the aforesaid guide structure being in the formof insetting coupling lugs carried by the ring member of the gear andcoupling blocks carried by the body member of the gear and in slidingfit with the lugs, there being freedom for sufficient Yte project toprevent longitudinal displacement Y of the toothed and body members ofthe gear.

S. A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are provided upon saidmembers, and wiich guide structure serves to define relative movement"between said members transversely of the axis of rotation, the toothedmember of the gear being of ring lilte formation and sufficientlyflexible to permit it to be moved with respect to the body member of thegear at the part where unusual load is encountered and beingsufficiently resilient to permit it to resume its proper shape when theundue load is removed, the aforesaid guide structure being in the formof insetting coupling lugs carried by the ring member of the gear andcoupling blocks carried by the body member of the gear and in slidingfit with the lugs, there being freedom for sufficient relative movementbetween the lugs and blocks to permit of the flexible movement of thering member of the gear and the accompanying movement of the couplinglugs carried thereby, the body member of the gear having spaced apartwall portions 10 into the spacing between which the insetting lugsproject to prevent longitudinal displacement of the toothed and bodymembers of the gear, there being also webs 12 which coperate with thelwall portions l0 in defining pockets in which the lugs reciprocate andwhich pockets are sufficiently deep to permit the lugs, when removed, tobe received fully therein.

9. A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to define relative movementbetween said members transversely of the axis of rotation, the toothedmember of the gear being of a ring like formation and sufficientlyffexible to permit it to be moved with respect to the body member of thegear at the part where unusual load is encountered Aand beingsufficiently resilient to permit it to resume its proper shape when theundue load is removed, the aforesaid guide structure portions being inthe form of insetting coupling lugs having channels upon their innerends extending transversely of the plane of the gear and carried by thering member of the gear and coupling blocks carried by the body memberof the gear and in sliding lugs are interposed and which engage the endfaces of'such coupling-lugs to prevent longitudinal separation of thegear members.

10. A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to define relative movementbetween said members transversely of the axis of rotation, the toothedmember of the gear being of ring like formation and sufficientlyflexible `to permit it to be moved with respect to the body member ofthe gear at the part where unusual load is encountered and beingsufficiently resilient to permit it to resume its proper shape when theundue load is Y removed, the aforesaid guide structure portions being inthe form of insetting coupling lugs having channels upon their innerends extending transversely of the plane of the gear and carried by thering member of the gear and coupling blocks carried by the body membervof the gear and in sliding fit with said lugs, sufficient clearanceintervening between the bottoms of the channels and the outermost facesof said blocks Vto permit of the flexible movement of the ring member ofthe gear andthe accompanying movement of the coupling lugs carriedthereby.

11. A gear including spaced apart toothed and body portions that arerelatively movable transversely of the axis of rotation; and a guidestructure having complemental portions that are provided upon said gearportions for defining the relative movement between said gear portionstransversely of the axis of i rotation and which guide structurevportions are in the form of channeled coupling lugs and coupling blocksentering the channels of the lugs. Y

l2. A gear including spaced apart toothed and body portions that arerelatively movable transversely of the axis of rotation; and a guidestructure having complemental portions that are provided upon said gearportions for defining the relative movement be tween said gear portionstransversely 'of the axis of rotation and which guide structure portionsare in the form of displaceable interengaging coupling lugs and couplingblocks, some of said guide structure portions being channeled to receiveguide structure portions complemental thereto.

13. A gear including spaced aparttoothed and body portions that arerelatively movable transversely of the axisof rotation; and

a guide structure having compiemental por- In Witness whereof, Ihereunto subscribe tions that are provided upon said gear por- Iny namethis 19th day of November A. D., tions 'for defining the relativemovement he- 1914.

tween said gear portions transversely of the HARRISGN L. HUDSON. 5 axisof rotation, one of said guide struc- Witnesses:

ture portions being removably mounted upon G. L. CRAGG,

the gear portion carrying it. ETTA L. W'HITE.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents. Washington, D. C.

